Although it doesn't really matter for two-sided surfaces, you should always try and draw polygons in a counter-clockwise direction. Also, the first three vertices should be < 180 degs.
If you do it differently, it's easy to fix - either Surface->flip-normal or surface->change-vertex order until it looks right (you will see an always-black polygon if the first 3 vertices are wrong). press 'n' to view normals - the direction a surfaces is facing.
Andy
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